Prepare the produce. You will want to split the ribs of celery in half and then thinly slice. Core and dice the apple. Finely chop the green onions, green part only.
Drain the salmon.
Combine all ingredients in a large bowl. Mix well, and enjoy.
Notes
Avoid storing this recipe for more than a day in the fridge. From a food safety standpoint it will probably be fine but the quality will deteriorate. Adding pecans would be a nice addition!